Sarah Ban BreathnachIn her book "Simple Abundance" and the sequels that have followed, Ban Breathnach counsels us to make way for spiritual improvement by cleaning out closets, kicking our shopping habits and generally weaning ourselves from material possessions. This not only allows us to see what's important, but forces us, by choosing what to keep, to explore who we are.

Sylvia BrowneBrowne believes the soul survives death, but unlike the religions that ascribe to the same view, she doesn't rely on faith and prayer alone to align herself with the divine. Knowledge and reason are her primary tools for reaching to a God she describes as both Father and Mother. Browne is one of the most prominent psychics in the country, with appearances on shows like "The Montel Williams Show" and "Unsolved Mysteries."Excerpt:A Guide to Common Dream Symbols

Deepak ChopraAfter a Western upbringing in India and success as an endocrinologist in the United States, Chopra discovered Eastern approaches to health and human empowerment through transcendental meditation. Since the early 1990s he has developed his own philosophy of holistic health based on the integral connection between mind and body, incorporating ideas from quantum physics and exploring the power of love and creativity. His teaching and his Chopra Centre for Well Being at La Jolla, Calif. have attracted celebrities Demi Moore, George Harrison, Michael Jackson, and Oprah Winfrey, among others.Interview:Spirituality in a Material WorldExcerpt:Pitfalls of the Seeker

John GrayThe author of "Men Are From Mars, Women Are From Venus," Gray is dedicated to promoting greater understanding between romantic partners. Gray's view, informed by his background in Eastern religions, is that relationship problems can be overcome by focusing on differences in how men and women communicate their needs and desires and by urging couples to respect those differences.

Andrew HarveyHarvey has studied Hinduism, Buddhism, and Christianity and has translated poems of the Sufi poet Rumi, an eclectic approach he explains in his book "The Direct Path" and his memoir, "The Sun at Midnight." More recently, he has stressed the feminine manifestations of God. He believes human beings are entering a new spiritual age to be governed by the Divine Mother.Review:Tracy Cochran on "The Direct Path"

Jean HoustonHouston teaches that most people conduct our lives using only a small part of our potential. She works to develop techniques to expand our learning skills and our creativity, bringing in philosophy, physics, and enlisting practices from many cultures. A protégé of Margaret Mead and an associate of the late Joseph Campbell, Houston has advised prominent figures -- most famously Hillary Clinton.Interview:Do Pet Owners Have a Spiritual Advantage?Excerpt:Pet Companions & the Mystic PathExcerpt:My Dog, the MadonnaWebsite:JeanHouston.org

Dan MillmanA former Olympic gymnast who told his story in "The Way of the Peaceful Warrior," Millman believes simple physical activity can connect us to broader spiritual awareness. To Millman, every moment of our lives is worthy of our complete attention and best effort, and his books aim to help readers apply this principle to personal enlightenment as well as balancing the family checkbook.Excerpt:Escaping a Madman With God's HelpWebsite:DanMillman.com

Thomas MooreThomas Moore became a household name with the publication of "The Care of the Soul," which urged readers to re-train themselves to experience the spirituality of everyday moments. A former Catholic monk and a psychotherapist, Moore counsels that we create space and find spiritual outlets so the soul may emerge and play its proper part in our lives.

James RedfieldRedfield's novel "The Celestine Prophecy," about a spiritual journey to Peru, has dominated bestseller lists since it appeared in 1993. Fascinated with the wisdom of ancient civilizations and with coincidence, Redfield is convinced that humans are about to enter a historic era of enlightenment.Interview:"Evolution Is a Spiritual Process"Excerpt:Basic Principles of Transformative Practice

Don Miguel Ruiz"It was common for me to witness miracles," says don Miguel Ruiz of his childhood in rural Mexico. He was raised by his mother and grandfather, who were both healers in the tradition of their ancestors, the Toltecs--an indigenous Mexican people who predated the Aztecs. This spiritual heritage is the inspiration for his books, including the best seller, "The Four Agreements."Interview:"My Life Is an Ongoing Prayer"Excerpt:The Liar That Lives in Your Head

Bernie SiegelFor more than 25 years, surgeon Bernie Siegel has been a pioneer in mind-body healing. In his best-selling "Love, Medicine & Miracles" and "Peace, Love & Healing," he wrote of his unorthodox approach to dealing with cancer patients—encouraging them to express their feelings, participate in medical decisions, and use healing methods such as meditation and guided imagery. He is also the founder of ECaP (Exceptional Cancer Patients).Tool:A Five Day Spiritual WorkoutInterview:How to Be a SurvivorExcerpt:Bernie Siegel's Soul PrescriptionsWebsite:ECaP.org

Neale Donald WalschA former radio personality and advertising executive experiencing a mid-life crisis, Walsch wrote an angry letter to God, and to his surprise, heard back. His bestselling book "Conversations With God" and its sequels grew out of this internal dialogue, through which Walsch learned that all experience, negative or positive, is part of the gift of life. He shares this message through philanthropic organizations and his retreat center in Oregon.Interview:Do We Need a "New God"?Interview:The End of the World As We Know It?Excerpt:An Invitation From GodDiscussion:About "Conversations With God"

Marianne WilliamsonDeeply affected by the Course in Miracles, which was the subject of her very successful "A Return to Love," Williamson's core teaching concerns the power of love to conquer fears and transform our lives. Her own expression of this message has taken many different forms, ranging from peace activism to becoming pastor of a New Thought church in Detroit. Her latest book, "Everyday Grace," takes up the importance of prayer and faith to achieving a life of power.

Gary ZukavOriginally a physicist whose popular 1979 book "Dance of the Wu Li Masters" lucidly explained quantum physics, Zukav turned to metaphysical matters with "The Seat of the Soul" and "Soul Stories." He believes the human race is transforming, breaking the bonds of the senses to achieve "authentic power," based in Eastern ideas about harmony, cooperation and reverence for life.Website:Zukav.com